柱形容器约束下内装粉体冲击响应特性

Investigation on Dynamic Response Characteristic of the Confined Powder under Impact Loading

子弹动力学行为受其内装粉体分布影响,而内装粉体子弹在冲击加载作用下粉体的密度演化规律及分布特征尚不明确。基于描述粉体材料的多孔材料模型及实测参数,采用有限元分析软件建立子弹锤击加载横向冲击的仿真模型,经对比典型工况的Machete锤击试验与仿真结果吻合较好。仿真结果表明:内装粉体冲击加载过程中密度变化可分为稳定段与增长段,可形成致密区、生长区、保持区和空隙区4个区域,各区域宽度随加载时间呈线性变化趋势,粉体密度分布具有显著梯度差异。研究结果可为冲击加载下内装粉体分布对子弹动力学行为影响相关研究提供参考。

The density evolution and distribution characteristics of powder in a submunition under impact loadingare studied.Based on the porous material model and the test parameters of the powder,a simulation model of impact loading is established by using finite element analysis software.Machete impact tests under typical working conditions are compard.The simulated results are constant with the test results.The simulated results show that the density change of powder in the submunition during impact loading can be divided into the stable and growth stages,which can form four regions:densification,growth,retention and interspace regions.The width of each region changes linearly with the loading time,and the density distribution of powder has a significant gradient difference.The research results can provide reference for the investigation on the dynamic behavior of submunition which is impacted by the distribution changes of powder.